The Guardian posted a story Thursday July 13, 2006 about tests that have been done to restore limb movement in a person who has been paralyzed for 5 years. And in the process of testing the brain’s ability to send signals, the doctors found that not only could the subject move a prosthetic limb, but they could also hook him up to a computer where he could manipulate full programs, such as MS Paint.

Scientists have for the first time developed a brain implant that allows people to control electronic devices by thought alone, it emerged yesterday.
…
Professor Donoghue’s work is published today in Nature. He describes how, after a few minutes spent calibrating the implant, Mr Nagle could read emails and play the computer game Pong. He was able to draw circular shapes using a paint programme and could also change channel and turn up the volume on a television, even while talking to people around him. After several months, he could also operate simple robotic devices such as a prosthetic hand, which he used to grasp and move objects.